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A rectifier in a drive converts

  • A.direct current to alternating current of controlled frequency
  • B.alternating current at one frequency to another frequency directly
  • C.direct current at one voltage to direct current at another
  • D.alternating current to direct current

Answer: D

Correct answer: alternating current to direct current

The rectifier is the input stage, converting the incoming ac supply into the dc that charges the link. The inverter at the other end converts that dc back to ac at whatever frequency the machine requires. Splitting the conversion in two through a dc link is what makes the output frequency independent of the supply.

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